EA411US Datasheet, PDF (1/15 Pages) Active-Semi, Inc – ActivePSRTM Quasi-Resonant PWM Controller

ACT411
Rev 4, 27-Feb-14
ActivePSR^TM Quasi-Resonant PWM Controller
FEATURES
• Patented Primary Side Regulation
Technology
• Quasi-Resonant Operation
• Adjustable up to 120kHz Switching
Frequency
• +/-5% Output Voltage Regulation
• Accurate OCP/OLP Protection
• Integrated Output Cord Compensation
• Integrated Line and Primary Inductance
Compensation
• Built-in Soft-Start Circuit
• Line Under-Voltage, Thermal, Output Over-
voltage, Output Short Protections
• Current Sense Resistor Short Protection
• Transformer Short Winding Protection
• Less than 100mW Standby Power
• Complies with Global Energy Efficiency and
CEC Average Efficiency Standards
• Tiny SOT23-6 Packages
and overload conditions, it would enter auto restart
mode including cycle-by-cycle current limiting.
ACT411 is to achieve no overshoot and very short
rise time even with big capacitive load (4000µF)
with the built-in fast and soft start process, .
The Quasi-Resonant (QR) operation mode can
effectively improve efficiency, reduce the EMI noise
and further reduce the components in input filter.
ACT411 is idea for application up to 36 Watt.
Figure 1:
Simplified Application Circuit
APPLICATIONS
• AC/DC Adaptors/Chargers for ADSL, PDAs,
E-books
• Adaptors for Portable Media Player, DSCs,
and Other
GENERAL DESCRIPTION
The ACT411 is a high performance peak current
mode PWM controller which applies ActivePSR^TM
and ActiveQR^TM technology. ACT411 achieves
accurate voltage regulation without the need of an
opto-coupler or reference device.
The ACT411 is designed to achieve less than
100mW Standby Power. By applying frequency fold
back and ActiveQR^TM technology, ACT411
exceeds the latest ES2.0 efficiency standard.
ACT411 integrates comprehensive protection. In
case of over temperature, over voltage, short
winding, short current sense resistor, open loop
Innovative Power^TM
-1-
ActivePSR^TM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2014 Active-Semi, Inc.